<?php
    $a = '{"code":"100013","msg":"Desc\uff1a0827237145\u4e0d\u662fDTAC\u9884\u4ed8\u8d39\uff080827237145\u4e0d\u662fDTAC\u9884\u4ed8\u8d39\uff09"}';

    $result = json_decode($a, true);

    echo $result['msg'];
